Theoretical study of topological natures of tetradymite compounds:from first-principles to compressed sensing method

报告题目: Theoretical study of topological natures of tetradymite compounds:from first-principles to compressed sensing method

报告人 : 刘惠军

时间 : 6月13日（星期四）上午10:00

地点 : 理科楼 LE201

邀请人  : 周小元

报告摘要：

Topological insulators (TIs) constitute a new class of quantum materials with insulating bulk but metallic boundary states. Protected by time-reversal symmetry, those boundary states possess spin-momentum locked Dirac structure in which all the backscattering channels are suppressed, favoring dissipationless electronic conduction. Nevertheless, there are relatively few stable TIs that feature optimal properties for the specific applications. In this work, using tetradymite compounds as a prototypical example class of materials, we have performed first-principles calculations to obtain reliable information on their topological natures. Based on the band inversion induced by spin-orbit coupling or the compressed sensing technique, we have proposed several simple and efficient criterions that allow ready screening of potential TIs.

报告人简介：

武汉大学教授、博导。1995年及1998年在武汉大学分别获学士和硕士学位，2003年在香港科技大学获博士学位，2012年在美国University of Pittsburgh进行访问研究。长期从事理论及计算凝聚态物理、计算材料科学的研究工作，特别是从第一性原理出发对材料的性质进行计算和设计新材料。现任中国材料研究学会计算材料学分会副秘书长、国际学术期刊Scientific Reports编委会成员。到目前为止，研究成果在Physical Review Letters、Physical Review B、Applied Physics Letters、Carbon等期刊上发表论文100余篇。